Comment by Enginerrrd

I think you’re missing a major point the article mentioned. High level athletes are genetic freaks that can tolerate much higher training loads. Recovery capacity is somewhat trainable within limits but there are limits and there’s a big genetic component to that. Hormonal environment matters too, but there’s a genetic component to that as well.

So there’s a huge selection bias in the population of people that can tolerate the training loads you’re talking about without having their bodies fail them and take them out of the population you’re thinking of.